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Bisighini B, Aguirre M, Biancolini ME, Trovalusci F, Perrin D, Avril S, Pierrat B. Machine learning and reduced order modelling for the simulation of braided stent deployment. Front Physiol 2023; 14:1148540. [PMID: 37064913 PMCID: PMC10090671 DOI: 10.3389/fphys.2023.1148540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Accepted: 03/16/2023] [Indexed: 03/31/2023] Open
Abstract
Endoluminal reconstruction using flow diverters represents a novel paradigm for the minimally invasive treatment of intracranial aneurysms. The configuration assumed by these very dense braided stents once deployed within the parent vessel is not easily predictable and medical volumetric images alone may be insufficient to plan the treatment satisfactorily. Therefore, here we propose a fast and accurate machine learning and reduced order modelling framework, based on finite element simulations, to assist practitioners in the planning and interventional stages. It consists of a first classification step to determine a priori whether a simulation will be successful (good conformity between stent and vessel) or not from a clinical perspective, followed by a regression step that provides an approximated solution of the deployed stent configuration. The latter is achieved using a non-intrusive reduced order modelling scheme that combines the proper orthogonal decomposition algorithm and Gaussian process regression. The workflow was validated on an idealized intracranial artery with a saccular aneurysm and the effect of six geometrical and surgical parameters on the outcome of stent deployment was studied. We trained six machine learning models on a dataset of varying size and obtained classifiers with up to 95% accuracy in predicting the deployment outcome. The support vector machine model outperformed the others when considering a small dataset of 50 training cases, with an accuracy of 93% and a specificity of 97%. On the other hand, real-time predictions of the stent deployed configuration were achieved with an average validation error between predicted and high-fidelity results never greater than the spatial resolution of 3D rotational angiography, the imaging technique with the best spatial resolution (0.15 mm). Such accurate predictions can be reached even with a small database of 47 simulations: by increasing the training simulations to 147, the average prediction error is reduced to 0.07 mm. These results are promising as they demonstrate the ability of these techniques to achieve simulations within a few milliseconds while retaining the mechanical realism and predictability of the stent deployed configuration.
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Affiliation(s)
- Beatrice Bisighini
- Mines Saint-Étienne, University Lyon, University Jean Monnet, INSERM, Saint-Étienne, France
- Predisurge, Grande Usine Creative 2, Saint-Etienne, France
- Department of Enterprise Engineering, University Tor Vergata, Rome, Italy
| | - Miquel Aguirre
- Mines Saint-Étienne, University Lyon, University Jean Monnet, INSERM, Saint-Étienne, France
- Laboratori de Càlcul Numèric, Universitat Politècnica de Catalunya, Barcelona, Spain
- International Centre for Numerical Methods in Engineering (CIMNE), Gran Capità, Barcelona, Spain
| | | | | | - David Perrin
- Predisurge, Grande Usine Creative 2, Saint-Etienne, France
| | - Stéphane Avril
- Mines Saint-Étienne, University Lyon, University Jean Monnet, INSERM, Saint-Étienne, France
| | - Baptiste Pierrat
- Mines Saint-Étienne, University Lyon, University Jean Monnet, INSERM, Saint-Étienne, France
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Ban E, Humphrey JD. New Computational Approach to Shunt Design in Congenital Heart Palliation. J Biomech 2023; 152:111568. [PMID: 37099931 DOI: 10.1016/j.jbiomech.2023.111568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 02/06/2023] [Accepted: 03/23/2023] [Indexed: 03/30/2023]
Abstract
Shunts are commonly used to redirect blood to pulmonary arteries in procedures that palliate congenital cardiovascular defects. Previous clinical studies and hemodynamic simulations reveal a critical role of shunt diameter in balancing flow to pulmonary versus systemic vessels, but the biomechanical process of creating the requisite anastomosis between the shunt and host vessel has received little attention. Here, we report a new Lagrange multiplier-based finite element approach that represents the shunt and host vessels as individual structures and predicts the anastomosis geometry and attachment force that result when the shunt is sutured at an incision in the host, followed by pressurization. Simulations suggest that anastomosis orifice opening increases markedly with increasing length of the host incision and moderately with increasing blood pressure. The host artery is further predicted to conform to common stiff synthetic shunts, whereas more compliant umbilical vessel shunts should conform to the host, with orifice area transitioning between these two extremes via a Hill-type function of shunt stiffness. Moreover, a direct relationship is expected between attachment forces and shunt stiffness. This new computational approach promises to aid in surgical planning for diverse vascular shunts by predicting in vivo pressurized geometries.
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Affiliation(s)
- E Ban
- Department of Biomedical Engineering, Yale University, New Haven, CT, USA
| | - J D Humphrey
- Department of Biomedical Engineering, Yale University, New Haven, CT, USA; Vascular Biology and Therapeutics Program, Yale School of Medicine, New Haven, CT, USA.
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Koch M, Arlandini C, Antonopoulos G, Baretta A, Beaujean P, Bex GJ, Biancolini ME, Celi S, Costa E, Drescher L, Eleftheriadis V, Fadel NA, Fink A, Galbiati F, Hatzakis I, Hompis G, Lewandowski N, Memmolo A, Mensch C, Obrist D, Paneta V, Papadimitroulas P, Petropoulos K, Porziani S, Savvidis G, Sethia K, Strakos P, Svobodova P, Vignali E. HPC+ in the medical field: Overview and current examples. Technol Health Care 2023:THC229015. [PMID: 36641699 DOI: 10.3233/thc-229015] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
BACKGROUND To say data is revolutionising the medical sector would be a vast understatement. The amount of medical data available today is unprecedented and has the potential to enable to date unseen forms of healthcare. To process this huge amount of data, an equally huge amount of computing power is required, which cannot be provided by regular desktop computers. These.
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Affiliation(s)
- Miriam Koch
- High-Performance Computing Center Stuttgart (HLRS), Stuttgart, Germany
| | | | | | | | - Pierre Beaujean
- Laboratory of Theoretical Chemistry, Namur Institute of Structured Matter, University of Namur, Namur, Belgium.,CINECA, Casalecchio di Reno, Italy
| | - Geert Jan Bex
- Data Science Institute, Hasselt University, Hasselt, Belgium
| | | | - Simona Celi
- BioCardioLab, Fondazione Toscana G Monasterio, Massa, Italy
| | - Emiliano Costa
- Viale Cesare Pavese, Rome, Italy for RINA rather than Via Corsica, Genova, Italy
| | - Lukas Drescher
- Swiss National Supercomputing Centre (CSCS), Lugano, Switzerland.,CINECA, Casalecchio di Reno, Italy
| | | | - Nur A Fadel
- Swiss National Supercomputing Centre (CSCS), Lugano, Switzerland
| | - Andreas Fink
- Swiss National Supercomputing Centre (CSCS), Lugano, Switzerland
| | - Federica Galbiati
- Viale Cesare Pavese, Rome, Italy for RINA rather than Via Corsica, Genova, Italy
| | | | | | | | | | - Carl Mensch
- Department of Mathematics, Faculty of Science, University of Antwerp, Antwerp, Belgium
| | | | | | | | | | | | | | | | | | - Petra Svobodova
- University of Bern, Bern, Switzerland.,CINECA, Casalecchio di Reno, Italy
| | - Emanuele Vignali
- BioCardioLab, Fondazione Toscana G Monasterio, Massa, Italy.,CINECA, Casalecchio di Reno, Italy
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